CN103093722A - Four-color light-emitting diode (LED) display sub-pixel restructuring method - Google Patents
Four-color light-emitting diode (LED) display sub-pixel restructuring method Download PDFInfo
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Abstract
The invention discloses a four-color light-emitting diode (LED) display sub-pixel restructuring method, and relates to an LED display. A single-frame high-resolution original image is sampled into a multi-frame image suitable for a low-resolution LED display through a pixel sampling algorithm aiming at three different LED display pixel structures of vertical stripes of red, green, blue and white (RGBW), a chessboard structure and a grid, and the image is displayed on the LED display. The brightness value shared by the RGB is replaced with a white LED by transforming the RGB color components of the separated low-resolution image into the luminance components of RGBW LED. The traditional pixel of the LED display is divided into single LED by using an LED display pixel restructuring technology, and adjacent LEDs of different pixels are restructured to form a new visual pixel. One-one mapping is carried out to each low-resolution image and the pixels of the LED with sub-pixels restructured, and the multi-frame low-resolution image is displayed in a mode of time division multiplexing.
Description
Technical field
The present invention relates to LED display, especially relate to four look LED display sub-pixel recombination methods.
Background technology
LED display is as a kind of high light efficiency, visual information carrier cheaply, and its application is in continuous expansion, and simultaneously, market requires also day by day to improve to the resolution of LED display, color rendition degree, power consumption, stability etc.Use RGBW four color pixels can reduce the power consumption of LED display 11%～33%, also can strengthen the color accuracy that shows image simultaneously.But compare the rgb pixel structure, the LED number of RGBW dot structure has increased by 1/3, has improved the hardware cost of LED display.At present, usually use the sub-pixel restructuring (also referred to as virtual pixel, pixel multiplexing, composite pixel, pixel sharing, pixel decomposition etc..) technology, in the situation that do not increase the resolution of LED number raising LED display on LED display.
Document [1] " A Novel RGBW Pixel for LED Displays " (author: Neveen Shlayan, Dr.Rama Venkat, Paolo Ginobbi, Glenn Mercier; The source: IEEE Computer Society, 2008,43:407-411) RGBW LED dot structure has been proposed, and with its spectrogram and the RGB display structure as a comparison, the display effect that draws both is basic identical.The last mode of measuring by experiment draws the RGBW dot structure and has saved 32% electric energy than rgb pixel structure.
Document [2] " A Modified Stripe-RGBW TFT-LCD with Image-Processing Engine for Mobile Phone Displays " (author: Chih-Chang Lai, Ching-Chih Tsai; Source: IEEE Transactions on Consumer Electronics, 2007,53(4): 1628-1633) simply enumerated existing RGBW dot structure, and the MS-RGBW dot structure proposed on this basis, its core concept is to regard 3 sub-pixels as a pixel, and the color component of the color component that lacks use neighbor as a supplement.Propose again afterwards a kind of color samples algorithm that improves image sharpness and contrast, through actual test, can obviously improve sharpness and the contrast of image.
Document [3] " LED display virtual pixel Principle and application " (author: Wang Qiaoli, Hao Zongchao; The source: the modern demonstration, 2004,2:33-35) sub-pixel reorganization scheme based on the 2R1G1B sub-pixel structure has been proposed.By use the sub-pixel recombinant technique on the rgb pixel basis of arranging with 2 * 2 matrix-style, be the display resolution of having realized (2M-1) * (2N-1) on the display screen of M * N in physical resolution.
Document [4] " Multicolor Virtual Matrix LED Display Controlled by D-Type Flip-Flop Drivers " (author: Alfonso Gago-Calder ó n, Jos é Fern á ndez-Ramos, and Alfonso Gago-Boh ó rquez; Source: JOURNAL OF DISPLAY TECHNOLOGY, 2011,7(4): 174-180) traditional rgb pixel is arranged in the hexagon mode, make the pixel can be multiplexing by 6 neighbors, can be in the situation that use same number of LED, the resolution of LED display is increased to original 8 times.
Checkerboard RGBW dot structure has only been proposed in document [1], not to existing other two kinds of RGBW dot structures---vertical strip RGBW and grid watt (Pentile) RGBW analyzes and verifies; The sub-pixel recombination method of document [2] can only improve 33% with the resolution of RGBW dot structure display screen, and practical application shows, it is many that this dot structure is only suitable for change color, repeatability is low, the image that is careless about lines shows, and is poor for the obvious image display effect of figure, fade effect of rule.Document [3] although in feasible to the sub-pixel recombinant technique of 2R1G1B dot structure, need 2 red sub-pixel, caused the waste of LED; Document [4] although the sub-pixel recombinant technique use the 1R1G1B dot structure, in the situation that similar number LED has realized than the higher resolution of document [3], but the hexagonal pixels structure of its use and the structure that need to again change LED display can't directly apply to existing LED display.
Summary of the invention
The object of the present invention is to provide a kind of four look LED display sub-pixel recombination methods.
The present invention is directed to the deficiency of existing vertical strip, checkerboard, three kinds of RGBW dot structures existence of grid watt (Pentile), on the basis that existing vertical strip, checkerboard, three kinds of RGBW dot structures of grid watt (Pentile) are analyzed, with the sub-pixel recombinant technique sub-pixel restructuring displaying scheme of combination with it, in the situation that do not increase LED quantity, the display resolution of display screen is increased to original 4～8 times to reach.
The present invention includes following steps:
1) for vertical strip RGBW, checkerboard, grid watt three kinds of different LED display dot structures, by the pixel sampling algorithm, the high-resolution original image of single frames is sampled as the image that multiframe is fit to the low resolution LED display, then shows on LED display;
2) the RGB color component of the low-resolution image after separating by handle is converted to the luminance component of RGBW LED, and the brightness value that RGB is total replaces with White LED;
3) use LED display sub-pixel recombinant technique, the conventional pixel of LED display is divided into single led, then the adjacent LED that belongs to different pixels is originally reconfigured, form new vision pixel;
4) image with each width low resolution shines upon one by one with the pixel on the LED that carries out after sub-pixel is recombinated, and by time-multiplexed method Alternation Display multiframe low-resolution image successively, completes the sub-pixel restructuring of four look LED display.
The present invention is a kind of novel planar display technique that combines four looks (RGBW) LED pixel and sub-pixel recombinant technique.This display technique generates by the high-definition picture that shows input is sampled according to specific algorithm the low-resolution image that multiframe meets LED display resolution; Respectively according to existing vertical strip, checkerboard, three kinds of RGBW pixel organization modes of grid watt (Pentile), according to the color component of every frame low-resolution image pixel, calculate the luminance component of four LED of red, green, blue and white (RGBW) afterwards; At last by four look LED on LED display are carried out time-sharing multiplex, the image of multiframe low resolution is alternately shown on LED display successively fast, reach the purpose of display of high resolution images on the low resolution LED display.The present invention combines RGBW dot structure and sub-pixel restructuring display technique, and the color accuracy that has simultaneously the RGBW dot structure is high, energy consumption is low, and the sub-pixel recombinant technique is not in the situation that increase the advantage that LED quantity improves the LED display image resolution ratio.
Advantage of the present invention is with respect to traditional RGB LED display, the RGBW LED display can be in the situation that have the same physical number of pixels with the power-dissipation-reduced 11%～33% of LED display, reduce the use cost of LED display, also improved the color accuracy of LED display the holiday of White LED; And based on RGBW LED display sub-pixel recombination method, the vision addressability of LED display is increased to original 4～8 times, not only made up RGBW four look LED display and shown the shortcoming that has more 1/3LED in the same pixel situation than RGB LED display, also promoted the fineness that shows image on the basis of not improving RGBW LED display production cost and structure.
Description of drawings
Fig. 1 is vertical strip pixel separation mode.
Fig. 2 is 4 kinds of vertical strip sub-pixel recombination forms.
Fig. 3 is the vision pixel distribution of vertical strip.
Fig. 4 is checkerboard pixel separation mode.
Fig. 5 is 4 kinds of checkerboard sub-pixel recombination forms.
Fig. 6 is the vision pixel distribution of checkerboard.
Fig. 7 is grid watt pixel separation mode.
Fig. 8 is 8 kinds of grids watt (Pentile) sub-pixel recombination forms.
Fig. 9 is the vision pixel distribution of grid watt (Pentile).
Embodiment
The present invention has proposed corresponding pixel reorganization method for vertical strip, checkerboard, grid watt (Pentile) respectively.
One, for the embodiment of vertical strip RGBW:
1, with resolution be the image that the original image of 4M * N is divided into 4 M * N resolution.The formula of sampling is as follows:
frame_buf[j][i÷M][i%M]＝src_buf[i÷M][(i%M)×4+j] （1）
Wherein src_buf is the BMP form picture element matrix of original image, and frame_buf is the BMP form picture element matrix of each two field picture after sampling, and j is frame number, and i is i pixel in the original image pixels matrix, and M is the horizontal resolution of LED display.
Concrete sample mode is as shown in Figure 1: in figure, each grid represents a pixel of 4M * N resolution original image, the numbering that is numbered corresponding M * N image in different resolution in square frame, and all pixels that are numbered j are put into the j frame the most at last.
2, calculating is with the color component of image on display screen of 4 M * N resolution.If i is the pixel level coordinate, j is pixel vertical coordinate, R
(i, j), G
(i, j), B
(i, j)Three colouring component numerical value for pixel (i, j) in original M * N image.The brightness R ' of four look LED of respective pixel on display screen
(i, j), G '
(i, j), B '
(i, j), W '
(i, j)Calculate by formula (2)～(5):
W′
(i,j)＝min{R
(i,j),G
(i,j),B
(i,j)} （2）
R′
(i,j)＝R
(i,j)-W′
(i,j) （3）
G′
(i,j)＝G
(i,j)-W′
(i,j) （4）
B′
(i,j)＝B
(i,j)-W′
(i,j) （5）
3, the LED luminance component that each pixel is corresponding maps to corresponding LED.What black box shown in Figure 2 was framed is a pixel, and black round dot position is the optic centre of pixel.With each pixel mapping in the 1st, 2,3,4 two field pictures to the pixel of Fig. 2 A, Fig. 2 B, Fig. 2 C, Fig. 2 D, the RGBW value of the luminance component of each LED for calculating according to the rgb value of respective pixel.
4, the 1st～4 two field picture in step 3 is alternately shown on LED successively fast, when the demonstration refresh rate was enough fast, the pixel that the display screen that human eye is experienced shows just as shown in Figure 3.
Two, for the embodiment of chessboard RGBW:
1, with resolution be the image that the original image of 2M * 2N is divided into 4 M * N resolution, the sampling formula is as follows:
frame_buf[0][i÷M][i%M]＝src_buf[(i÷M)×2][(i%M)×2] （6）
frame_buf[1][i÷M][i%M]＝src_buf[(i÷M)×2][(i%M)×2+1] （7）
frame_buf[2][i÷M][i%M]＝src_buf[(i÷M)×2+1][(i%M)×2] （8）
frame_buf[3][i÷M][i%M]＝src_buf[(i÷M)×2+1][(i%M)×2+1] （9）
Wherein src_buf is the BMP form picture element matrix of original image, frame_buf[X] be the BMP form picture element matrix of the X two field picture after sampling, j is frame number, and i is i pixel in the original image pixels matrix, and M is the horizontal resolution of LED display.
Concrete sample mode is as shown in Figure 4: in figure, each grid represents a pixel of 2M * 2N resolution original image, the numbering that is numbered corresponding M * N image in different resolution in square frame, and all pixels that are numbered j are put into the j frame the most at last.
2, calculating is with the color component of image on display screen of 4 M * N resolution.If R
(i, j), G
(i, j), B
(i, j)Be three colouring component numerical value of pixel (i, j) in original M * N image, the brightness R ' of four look LED of respective pixel on display screen
(i, j), G '
(i, j), B '
(i, j), W '
(i, j)Calculate by formula (2)～(5).
3, the LED luminance component that each pixel is corresponding maps to corresponding LED.What black box shown in Figure 5 was framed is a pixel, and black round dot position is the optic centre of pixel.With each pixel mapping in the 1st, 2,3,4 two field pictures to the pixel of Fig. 5 A, Fig. 5 B, Fig. 5 C, Fig. 5 D, the RGBW value of the luminance component of each LED for calculating according to the rgb value of respective pixel.
4, the 1st～4 two field picture in step 3 is alternately shown on LED successively fast, when the demonstration refresh rate was enough fast, the pixel that the display screen that human eye is experienced shows just as shown in Figure 6.
Three, for the embodiment of grid watt (Pentile) RGBW:
1, with resolution be the image that the original image of 4M * 2N is divided into 8 M * N resolution, the sampling formula is as follows:
frame_buf[0][i÷M][i%M]＝src_buf[(i÷M)×2][(i%M)×4] （10）
frame_buf[1][i÷M][i%M]＝src_buf[(i÷M)×2][(i%M)×4+1] （11）
frame_buf[2][i÷M][i%M]＝src_buf[(i÷M)×2][(i%M)×4+2] （12）
frame_buf[3][i÷M][i%M]＝src_buf[(i÷M)×2][(i%M)×4+3] （13）
frame_buf[4][i÷2M][i%2M]＝src_buf[(i÷2M)×4+3][(i%2M)×2] （14）
frame_buf[5][i÷2M][i%2M]＝src_buf[(i÷2M)×4+3][(i%2M)×2+1] （15）
frame_buf[6][i÷2M][i%2M]＝src_buf[(i÷2M)×4+1][(i%2M)×2] （16）
frame_buf[7][i÷2M][i%2M]＝src_buf[(i÷2M)×4+1][(i%2M)×2+1] （17）
Wherein src_buf is the BMP form picture element matrix of original image, frame_buf[X] be the BMP form picture element matrix of the X two field picture after sampling, j is frame number, and i is i pixel in the original image pixels matrix, and M is the horizontal resolution of LED display.
Concrete sample mode is as shown in Figure 7: in figure, each grid represents a pixel of 8M * 2N resolution original image, the numbering that is numbered corresponding M * N image in different resolution in square frame, and all pixels that are numbered j are put into the j frame the most at last.
2, calculating is with the color component of image on display screen of 8 M * N resolution.If R
(i, j), G
(i, j), B
(i, j)Be three colouring component numerical value of pixel (i, j) in original M * N image, the brightness R ' of four look LED of respective pixel on display screen
(i, j), G '
(i, j), B '
(i, j), W '
(i, j)Calculate by formula (2)～(5).
3, the LED luminance component that each pixel is corresponding maps to corresponding LED.What black box shown in Figure 8 was framed is a pixel, and black round dot position is the optic centre of pixel.With each pixel mapping in the 1st, 2,3,4 two field pictures to the pixel of Fig. 8 A, Fig. 8 B, Fig. 8 C, Fig. 8 D, the RGBW value of the luminance component of each LED for calculating according to the rgb value of respective pixel.
4, the 1st～8 two field picture in step 3 is alternately shown on LED successively fast, when the demonstration refresh rate was enough fast, the pixel that the display screen that human eye is experienced shows just as shown in Figure 9.
Claims (1)
1. four look LED display sub-pixel recombination methods is characterized in that comprising the following steps:
1) for vertical strip RGBW, checkerboard, grid watt three kinds of different LED display dot structures, by the pixel sampling algorithm, the high-resolution original image of single frames is sampled as the image that multiframe is fit to the low resolution LED display, then shows on LED display;
2) the RGB color component of the low-resolution image after separating by handle is converted to the luminance component of RGBW LED, and the brightness value that RGB is total replaces with White LED;
3) use LED display sub-pixel recombinant technique, the conventional pixel of LED display is divided into single led, then the adjacent LED that belongs to different pixels is originally reconfigured, form new vision pixel;
4) image with each width low resolution shines upon one by one with the pixel on the LED that carries out after sub-pixel is recombinated, and by time-multiplexed method Alternation Display multiframe low-resolution image successively, completes the sub-pixel restructuring of four look LED display.
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| CN113971633A (en) * | 2021-10-25 | 2022-01-25 | 深圳蓝普视讯科技有限公司 | Flip chip space pixel arrangement structure, pixel multiplexing method, system, device and storage medium |
| CN113971633B (en) * | 2021-10-25 | 2022-12-06 | 深圳蓝普视讯科技有限公司 | Flip chip spatial pixel multiplexing method, system, device and storage medium |
| CN115938313A (en) * | 2022-09-30 | 2023-04-07 | 深圳市科金明电子股份有限公司 | Display driving method and device, liquid crystal controller, display system and projection device |
| CN115938313B (en) * | 2022-09-30 | 2023-08-29 | 深圳市科金明电子股份有限公司 | Display driving method and device, liquid crystal controller, display system and projection device |
| US11862123B1 (en) | 2022-09-30 | 2024-01-02 | Shenzhen Kejinming Electronic Co., Ltd | Display driving method and device, liquid crystal controller, display system and projection device |
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